CN112344510A - Compressor cooling control method for air conditioning unit - Google Patents
Compressor cooling control method for air conditioning unit Download PDFInfo
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- CN112344510A CN112344510A CN201910726936.5A CN201910726936A CN112344510A CN 112344510 A CN112344510 A CN 112344510A CN 201910726936 A CN201910726936 A CN 201910726936A CN 112344510 A CN112344510 A CN 112344510A
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- 238000001816 cooling Methods 0.000 title claims abstract description 75
- 238000004378 air conditioning Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 54
- 239000007788 liquid Substances 0.000 claims abstract description 50
- 239000007921 spray Substances 0.000 claims abstract description 5
- 238000005507 spraying Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 abstract description 41
- 239000007924 injection Substances 0.000 abstract description 41
- 239000003507 refrigerant Substances 0.000 abstract description 26
- 230000000694 effects Effects 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 230000003247 decreasing effect Effects 0.000 description 6
- 238000013021 overheating Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002826 coolant Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/006—Cooling of compressor or motor
- F25B31/008—Cooling of compressor or motor by injecting a liquid
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to a compressor cooling control method for an air conditioning unit. The invention aims to solve the problem that the existing air conditioning unit has a poor cooling mode for a compressor. Therefore, the air conditioning unit comprises a liquid injection pipeline, a main circulation loop, a compressor, a condenser, an electronic expansion valve and an evaporator, wherein the compressor, the condenser, the electronic expansion valve and the evaporator are arranged on the main circulation loop, the liquid injection pipeline can carry out spray cooling on the compressor, and the electronic expansion valve is arranged between the condenser and the evaporator, and the compressor cooling control method comprises the following steps: acquiring the temperature of a compressor; acquiring the pressure ratio of the compressor; if the temperature of the compressor is higher than the preset temperature and the pressure ratio of the compressor is lower than the preset pressure ratio, the opening of the electronic expansion valve is controlled according to the temperature and the pressure ratio of the compressor, so that the pressure difference between the condenser and the liquid injection pipeline is changed, and the liquid injection pipeline can be effectively guaranteed to supply enough refrigerants to the compressor for cooling.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a compressor cooling control method for an air conditioning unit.
Background
Along with the continuous improvement of living standard of people, people also put forward higher and higher requirements on living environment. In order to maintain a comfortable ambient temperature, air conditioning units have become an essential device in human life. Although various designs of the air conditioning unit are more and more mature in recent years, the existing air conditioning unit still has some problems; for example, the compressor is an essential element of each air conditioning unit, and the compressor can change the state of the refrigerant through its own compression action, so that the compressor is easy to generate heat during operation. Particularly, for the inverter compressor, the inverter compressor is easy to generate an overheating phenomenon in the speed increasing process, so that the temperature of the compressor is overhigh; meanwhile, if the temperature of the compressor cannot be timely reduced, the compressor is easily burnt out, and the whole air conditioning unit cannot continue to work normally. Therefore, the operation of spray cooling the compressor is not negligible, and the existing air conditioning unit generally achieves the effect of cooling the compressor by arranging a liquid spray pipeline, namely, the cooling effect is achieved by directly introducing the refrigerant cooled by the condenser into the compressor.
Furthermore, a cooling port is usually arranged on the existing compressor, the liquid injection pipeline is connected with the cooling port, so that a refrigerant in the liquid injection pipeline can enter the compressor through the cooling port, a liquid refrigerant entering the compressor can realize a heat absorption effect through evaporation to reduce the temperature of the compressor, and an electromagnetic valve is further arranged at the cooling port to control the on-off of the liquid injection pipeline. Because the condenser belongs to a high-pressure environment, the existing air conditioning units only press the refrigerant into the compressor under the action of the high pressure; however, for the situation that the air conditioning unit is just started or the load of the air conditioning unit is suddenly increased, the compressor usually needs to be greatly increased in rotation speed, at this time, the compressor generates a large amount of heat, although there is a pressure difference between the condenser and the liquid injection pipeline, the pressure difference is not enough to provide enough refrigerant for cooling the compressor at all, so that the problem of insufficient cooling of the compressor is easily caused, and the normal use of the unit is even affected in severe cases. Certainly, in some existing air conditioning units, a refrigerant pump is additionally arranged on a liquid injection pipeline to ensure the supply of refrigerant, but since the refrigerant pump and the electromagnetic valve arranged at the cooling port cannot realize synchronous control, technicians need to additionally arrange one-way check valves at two ends of the refrigerant pump to realize bypass. In the operation process, when the electromagnetic valve is opened, the refrigerant pump can directly supply the refrigerant to the compressor for cooling; when the electromagnetic valve is closed, the refrigerant in the refrigerant pump can perform self-circulation through the bypass pipeline; therefore, the control mode of the cooling structure is complicated, and error control is easy to occur. In addition, the coolant still causes cavitation to the inner structure of coolant pump very easily to lead to coolant pump's reliability and life to reduce by a wide margin.
Accordingly, there is a need in the art for a new compressor cooling control method for an air conditioning unit that solves the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the cooling mode of the existing air conditioning unit for cooling the compressor is not good, the present invention provides a compressor cooling control method for an air conditioning unit, where the air conditioning unit includes a liquid injection pipeline, a main circulation loop, and a compressor, a condenser, an electronic expansion valve, and an evaporator that are arranged on the main circulation loop, where the liquid injection pipeline can spray-cool the compressor, and the electronic expansion valve is arranged between the condenser and the evaporator, and the compressor cooling control method includes: acquiring the temperature of the compressor; acquiring a pressure ratio of the compressor; and if the temperature of the compressor is higher than the preset temperature and the pressure ratio of the compressor is lower than the preset pressure ratio, controlling the opening degree of the electronic expansion valve according to the temperature and the pressure ratio of the compressor.
In a preferred embodiment of the above method for controlling cooling of a compressor of an air conditioning unit, if the temperature of the compressor is higher than a preset temperature and the pressure ratio of the compressor is lower than a preset pressure ratio, the step of controlling the opening of the electronic expansion valve according to the temperature and the pressure ratio of the compressor specifically includes: and if the time that the temperature of the compressor is continuously greater than the preset temperature reaches a first preset time and the condition that the pressure ratio of the compressor is smaller than the preset pressure ratio occurs in the first preset time, controlling the opening degree of the electronic expansion valve according to the temperature and the pressure ratio of the compressor.
In a preferred embodiment of the above method for controlling cooling of a compressor of an air conditioning unit, if the temperature of the compressor is higher than a preset temperature and the pressure ratio of the compressor is lower than a preset pressure ratio, the step of controlling the opening of the electronic expansion valve according to the temperature and the pressure ratio of the compressor specifically includes: and if the time that the temperature of the compressor is continuously greater than the preset temperature reaches a second preset time and the pressure ratio of the compressor is continuously less than the preset pressure ratio within the second preset time, controlling the opening degree of the electronic expansion valve according to the temperature and the pressure ratio of the compressor.
In a preferred embodiment of the above method for controlling cooling of a compressor of an air conditioning unit, the step of "controlling the opening degree of the electronic expansion valve according to the temperature and pressure ratio of the compressor" includes: and reducing the opening degree of the electronic expansion valve by a preset opening degree, wherein the preset opening degree is determined according to the difference value between the temperature of the compressor and the preset temperature and/or the difference value between the pressure ratio of the compressor and the preset pressure ratio.
In a preferable embodiment of the above method for controlling cooling of a compressor for an air conditioning unit, the step of reducing the opening degree of the electronic expansion valve by a preset opening degree further includes: and reducing the opening degree of the electronic expansion valve by a preset opening degree every third preset time.
In a preferred embodiment of the above-mentioned method for controlling cooling of a compressor for an air conditioning unit, after the step of "controlling the opening degree of the electronic expansion valve according to the temperature and pressure ratio of the compressor" is performed, the method further includes: obtaining the temperature of the compressor again; and if the temperature of the compressor is less than or equal to the preset temperature, the opening degree of the electronic expansion valve is not controlled according to the temperature and the pressure ratio of the compressor.
In a preferred embodiment of the above-mentioned method for controlling cooling of a compressor for an air conditioning unit, after the step of "controlling the opening degree of the electronic expansion valve according to the temperature and pressure ratio of the compressor" is performed, the method further includes: obtaining the pressure ratio of the compressor again; and if the pressure ratio of the compressor is greater than or equal to the preset pressure ratio, the opening degree of the electronic expansion valve is not controlled according to the temperature and the pressure ratio of the compressor any more.
In a preferred embodiment of the above-mentioned method for controlling cooling of a compressor for an air conditioning unit, after the step of "controlling the opening degree of the electronic expansion valve according to the temperature and pressure ratio of the compressor" is performed, the method further includes: acquiring the high-pressure of the compressor; and if the time that the high-pressure of the compressor is continuously greater than the preset high-pressure reaches a fourth preset time, the opening degree of the electronic expansion valve is not controlled according to the temperature and the pressure ratio of the compressor.
In a preferred embodiment of the above-mentioned method for controlling cooling of a compressor for an air conditioning unit, after the step of "controlling the opening degree of the electronic expansion valve according to the temperature and pressure ratio of the compressor" is performed, the method further includes: acquiring the low-pressure of the compressor; and if the time that the low-pressure of the compressor is continuously less than the preset low-pressure reaches a fifth preset time, the opening degree of the electronic expansion valve is not controlled according to the temperature and the pressure ratio of the compressor.
In a preferred embodiment of the above-mentioned method for controlling cooling of a compressor for an air conditioning unit, after the step of "controlling the opening degree of the electronic expansion valve according to the temperature and pressure ratio of the compressor" is performed, the method further includes: if the target load of the compressor is less than a preset load, operating the compressor at the preset load; operating the compressor at the target load if the target load of the compressor is greater than or equal to the preset load.
As can be understood by those skilled in the art, in the technical solution of the present invention, an air conditioning unit of the present invention includes a liquid injection pipeline, a main circulation loop, and a compressor, a condenser, an electronic expansion valve and an evaporator which are arranged on the main circulation loop, wherein the liquid injection pipeline can perform spray cooling on the compressor, the electronic expansion valve is arranged between the condenser and the evaporator, and the compressor cooling control method of the present invention includes: acquiring the temperature of the compressor; acquiring a pressure ratio of the compressor; and if the temperature of the compressor is higher than the preset temperature and the pressure ratio of the compressor is lower than the preset pressure ratio, controlling the opening degree of the electronic expansion valve according to the temperature and the pressure ratio of the compressor. It can be understood that the air conditioning unit can change the pressure in the condenser by changing the opening degree of the electronic expansion valve, so as to change the pressure difference between the condenser and the liquid injection pipeline, so that the refrigerant in the condenser can smoothly enter the compressor through the liquid injection pipeline. In the invention, under the condition that the temperature of the compressor is higher than the preset temperature and the pressure ratio of the compressor is lower than the preset pressure ratio, the compressor is overheated and the pressure difference between the condenser and the liquid injection pipeline is insufficient; under the condition, the air conditioning unit can control the opening of the electronic expansion valve according to the temperature and pressure ratio of the compressor, so that the air conditioning unit can change the pressure difference between the condenser and the liquid injection pipeline by changing the opening of the electronic expansion valve, thereby effectively ensuring that the liquid injection pipeline can supply enough cooling refrigerants into the compressor, and further effectively ensuring the cooling effect of the compressor.
Further, in a preferred technical solution of the present invention, if the time that the temperature of the compressor is continuously greater than the preset temperature reaches the first preset time and the pressure ratio of the compressor is smaller than the preset pressure ratio occurs within the first preset time, it is determined that the compressor has an overheating phenomenon and the pressure difference between the condenser and the liquid injection pipeline is insufficient, so as to effectively improve the accuracy of the determination result.
Further, in a preferred technical solution of the present invention, if the time that the temperature of the compressor is continuously greater than the preset temperature reaches the second preset time and the pressure ratio of the compressor is continuously less than the preset pressure ratio within the second preset time, it is determined that the compressor has an overheating phenomenon and the pressure difference between the condenser and the liquid injection pipeline is insufficient, so as to effectively improve the accuracy of the determination result.
Further, in a preferred embodiment of the present invention, when the compressor is overheated and the pressure difference between the condenser and the liquid injection pipeline is insufficient, the air conditioning unit may decrease the opening degree of the electronic expansion valve by the preset opening degree every third preset time, so that the opening degree of the electronic expansion valve may be gradually decreased; it can be understood that, in the process of continuously decreasing the opening degree of the electronic expansion valve, a large amount of refrigerant is also gradually accumulated in the condenser, so that the pressure in the condenser is continuously increased, thereby effectively increasing the pressure difference between the condenser and the liquid injection pipeline, and further effectively increasing the refrigerant supply speed of the liquid injection pipeline. Preferably, the invention can also determine the preset opening according to the difference between the temperature of the compressor and the preset temperature and/or the difference between the pressure ratio of the compressor and the preset pressure ratio; specifically, the larger the difference between the temperature of the compressor and the preset temperature is, and/or the smaller the difference between the pressure ratio of the compressor and the preset pressure ratio is, the larger the preset opening degree is; that is, the stronger the cooling requirement of the compressor is, or the smaller the pressure difference between the condenser and the liquid injection pipeline is, the faster the electronic expansion valve is closed, so as to increase the pressure difference between the condenser and the liquid injection pipeline more quickly, and further enable the liquid injection pipeline to supply the refrigerant as required as soon as possible.
Further, in a preferred technical solution of the present invention, if the temperature of the compressor is less than or equal to the preset temperature, it indicates that the temperature of the compressor has been reduced to a sufficiently low temperature, and the compressor does not need to be cooled continuously, so that the opening degree of the electronic expansion valve is no longer controlled according to the temperature and pressure ratio of the compressor, so as to effectively ensure the heat exchange effect of the air conditioning unit.
Further, in a preferred technical solution of the present invention, if the pressure ratio of the compressor is greater than or equal to the preset pressure ratio, it indicates that the pressure difference between the condenser and the liquid injection pipeline is sufficiently large, that is, the refrigerant supply speed of the liquid injection pipeline is sufficiently fast, so that the opening degree of the electronic expansion valve is no longer controlled according to the temperature and the pressure ratio of the compressor, so as to effectively ensure the heat exchange effect of the air conditioning unit.
Further, in a preferred technical solution of the present invention, if the time that the high pressure of the compressor is continuously greater than the preset high pressure reaches the fourth preset time, it indicates that the compressor has a high pressure warning, and in order to effectively ensure the normal operation of the compressor, in this case, the opening degree of the electronic expansion valve is no longer controlled according to the temperature and the pressure ratio of the compressor, so as to effectively ensure the normal operation of the compressor.
Further, in a preferred technical solution of the present invention, if the time that the low pressure of the compressor is continuously less than the preset low pressure reaches the fifth preset time, it indicates that the compressor has a low pressure warning, and in order to effectively ensure the normal operation of the compressor, in this case, the opening degree of the electronic expansion valve is no longer controlled according to the temperature and the pressure ratio of the compressor, so as to effectively ensure the normal operation of the compressor.
Further, in a preferred technical solution of the present invention, if the target load of the compressor is less than the preset load, the compressor is operated at the preset load; it can be understood that when the operating load of the compressor is too small, various fault problems of the compressor can be easily caused in the operating process, including the problem that the temperature of the compressor is too fast to cause too high temperature, so that when the target load of the compressor is less than the preset load, the air conditioning unit controls the compressor to operate at the preset load, so as to effectively ensure that the compressor can work efficiently. Meanwhile, if the target load of the compressor is greater than or equal to the preset load, the compressor is directly operated at the target load so as to effectively guarantee the working requirement of the compressor.
Drawings
Fig. 1 is a schematic view of the overall structure of the air conditioning unit of the present invention;
FIG. 2 is a flow chart of the main steps of the compressor cooling control method of the present invention;
fig. 3 is a flowchart of the steps of a preferred embodiment of the compressor cooling control method of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the steps of the method of the present invention are described herein in a particular order, these orders are not limiting, and one skilled in the art may perform the steps in a different order without departing from the underlying principles of the invention.
It should be noted that in the description of the preferred embodiment of the present invention, the terms "left", "right", "inside", "outside", and the like, which indicate the direction or positional relationship, are based on the directions or positional relationships shown in the drawings, which are for convenience of description only, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. It should also be noted that, unless otherwise expressly specified or limited in this description of preferred embodiments of the invention, the terms "connected," "connected," and the like are to be construed broadly and can include, for example, direct connection, indirect connection through an intermediary, and communication between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring first to fig. 1, the overall structure of the air conditioning unit of the present invention is schematically shown. As shown in fig. 1, the air conditioning unit of the present invention includes a main circulation loop, and a compressor 1, a condenser 2, an electronic expansion valve 3, and an evaporator 4 sequentially disposed on the main circulation loop, wherein a refrigerant in the air conditioning unit realizes circulation through the main circulation loop to realize heat exchange; of course, for convenience of description, fig. 1 only shows the main elements of the air conditioning unit, and a technician may set the specific structure of the air conditioning unit according to the actual use requirement, and the present invention does not set any limitation on the specific structure of the air conditioning unit, and such specific structural changes do not depart from the basic principle of the present invention, and belong to the protection scope of the present invention. The air conditioning unit further comprises a liquid spraying pipeline 5, a cooling hole is formed in the compressor 1, an electromagnetic valve is arranged at the position of the cooling hole, one end of the liquid spraying pipeline 5 is connected with the lower end of the condenser 2, the other end of the liquid spraying pipeline is connected with the cooling hole, so that a refrigerant in the condenser 2 can directly enter the compressor 1 through the cooling hole, and the electromagnetic valve at the position of the cooling hole can control the on-off of the liquid spraying pipeline 5. It should be noted that, the invention does not limit the specific arrangement mode of the liquid spraying pipeline 5, and technicians can set the mode according to actual use requirements; for example, one end of the liquid injection line 5 may be connected between the condenser 2 and the electronic expansion valve 3, and the specific location of the cooling port may be changed as long as the liquid injection line 5 can directly introduce the cooled refrigerant into the compressor 1. In addition, the air conditioning unit also comprises a touch display screen, and a user can control the running condition of the air conditioning unit through the touch display screen; of course, this arrangement is not restrictive, that is, the air conditioning unit may also be provided without the touch display screen, or with a touch-button display screen, etc., and this specific structure may be changed without departing from the basic principle of the present invention.
Further, the air conditioning unit further includes a temperature sensor capable of measuring the temperature of the compressor 1, and a controller capable of acquiring measurement data of the temperature sensor, and also capable of controlling the operation of the air conditioning unit, for example, controlling the opening degree of the electronic expansion valve 3, controlling the open/close state of the solenoid valve, and the like. It can be understood by those skilled in the art that the present invention does not limit the specific structure and type of the controller, as long as the controller can achieve the above functions, and the controller may be the original controller of the air conditioning unit, or a controller separately configured to execute the compressor cooling control method of the present invention, and the structure and type of the controller may be set by a technician according to actual use requirements. In addition, it should be noted that, a technician can set an application object of the compressor cooling control method according to actual use requirements; since the inverter compressor is easily subjected to the condition of overhigh temperature, the compressor cooling control method of the invention is preferably applied to the magnetic suspension inverter centrifugal type air conditioning unit, and of course, the specific application objects do not deviate from the basic principle of the invention and the method belongs to the protection scope of the invention.
Referring now to fig. 2, a flow chart of the main steps of the compressor cooling control method of the present invention is shown. As shown in fig. 2, based on the air conditioning unit described in the foregoing embodiment, the method for controlling cooling of the compressor of the present invention mainly includes the following steps:
s1: acquiring the temperature of a compressor;
s2: acquiring the pressure ratio of the compressor;
s3: and if the temperature of the compressor is higher than the preset temperature and the pressure ratio of the compressor is lower than the preset pressure ratio, controlling the opening degree of the electronic expansion valve according to the temperature and the pressure ratio of the compressor.
Further, in step S1, the controller acquires the temperature of the compressor 1 through the temperature sensor; it should be noted that the present invention does not limit any specific way for the controller to acquire the temperature of the compressor 1, as long as the controller can acquire the temperature of the compressor 1. Next, in step S2, the controller can obtain the absolute pressure of the exhaust port and the absolute pressure of the suction port of the compressor 1, and then calculate the ratio of the absolute pressure of the exhaust port to the absolute pressure of the suction port, and record the ratio as the pressure ratio of the compressor 1; it should be noted that, the present invention does not limit the manner in which the controller obtains the absolute pressure of the exhaust port and the absolute pressure of the suction port of the compressor 1, and a technician may set the absolute pressure according to actual needs as long as the controller can finally obtain the pressure ratio of the compressor 1. Further, it can be understood by those skilled in the art that the execution sequence of the steps S1 and S2 can be self-set, that is, the controller can obtain the temperature of the compressor 1 first, the pressure ratio of the compressor 1 first, or both the temperature and the pressure ratio of the compressor 1, without departing from the basic principle of the present invention.
Further, in step S3, if the controller determines that the temperature of the compressor 1 is greater than the preset temperature and the pressure ratio of the compressor 1 is less than the preset pressure ratio, it indicates that the compressor 1 is overheated and the pressure difference between the condenser 2 and the liquid injection pipeline 5 is insufficient; at this time, the controller can control the opening degree of the electronic expansion valve 3 according to the temperature and the pressure ratio of the compressor 1, thereby changing the pressure difference between the condenser 2 and the liquid injection pipe 5. It should be noted that the present invention does not limit the specific control manner, that is, a technician can set the opening degree adjustment manner of the electronic expansion valve 3 according to the actual use requirement, and it is within the protection scope of the present invention as long as the controller controls the opening degree of the electronic expansion valve 3 according to the temperature and the pressure ratio of the compressor 1. In addition, it should be noted that, a technician may set the values of the preset temperature and the preset pressure ratio according to actual use requirements, as long as the compressor 1 is overheated when the temperature is higher than the preset temperature, and the compressor 1 is insufficient in pressure difference between the condenser 2 and the liquid injection pipeline 5 when the pressure ratio is lower than the preset pressure ratio.
Finally, referring to FIG. 3, a flow chart of the steps of a preferred embodiment of the compressor cooling control method of the present invention is shown. As shown in fig. 3, based on the air conditioning unit described in the foregoing embodiment, a preferred embodiment of the method for controlling cooling of a compressor of the present invention specifically includes the following steps:
s101: acquiring the temperature and the pressure ratio of a compressor;
s102: judging whether the temperature of the compressor is higher than a preset temperature and the pressure ratio of the compressor is lower than a preset pressure ratio; if yes, executing step S103; if not, executing step S101;
s103: reducing the opening degree of the electronic expansion valve by a preset opening degree;
s104: obtaining the temperature of the compressor again;
s105: judging whether the temperature of the compressor is less than or equal to a preset temperature or not; if yes, go to step S106; if not, executing step S107;
s106: the opening degree of the electronic expansion valve is not controlled according to the temperature and the pressure ratio of the compressor;
s107: obtaining the pressure ratio of the compressor again;
s108: judging whether the pressure ratio of the compressor is greater than or equal to a preset pressure ratio or not; if yes, go to step S106; if not, go to step S109;
s109: acquiring the high-pressure of a compressor;
s110: judging whether the time that the high-pressure of the compressor is continuously greater than the preset high-pressure reaches a fourth preset time or not; if yes, go to step S106; if not, executing step S111;
s111: acquiring the low-pressure of the compressor;
s112: judging whether the time that the low-pressure of the compressor is continuously less than the preset low-pressure reaches a fifth preset time or not; if yes, go to step S106; if not, executing step S113;
s113: judging whether the opening degree of the electronic expansion valve is larger than a preset minimum opening degree or not; if yes, executing step S103; if not, executing step S114;
s114: the opening degree of the electronic expansion valve is not reduced any more.
Further, in step S101, the controller obtains the temperature of the compressor 1 through the temperature sensor; as a preferred embodiment, when the compressor 1 is an inverter compressor, the temperature sensor is disposed near an inverter of the compressor 1 so as to acquire a temperature of the inverter as the temperature of the compressor 1. In addition, it should be noted that the present invention does not limit the specific way in which the controller obtains the temperature of the compressor 1, as long as the controller can obtain the temperature of the compressor 1. Meanwhile, the controller can also obtain the absolute pressure of an exhaust port and the absolute pressure of an air suction port of the compressor 1, then calculate the ratio of the absolute pressure of the exhaust port to the absolute pressure of the air suction port and record the ratio as the pressure ratio of the compressor 1; it should be noted that, the present invention does not limit the manner in which the controller obtains the absolute pressure of the exhaust port and the absolute pressure of the suction port of the compressor 1, and a technician may set the absolute pressure according to actual needs as long as the controller can finally obtain the pressure ratio of the compressor 1.
Further, in step S102, the controller is capable of determining whether the temperature of the compressor 1 is greater than the preset temperature and whether the pressure ratio of the compressor 1 is less than the preset pressure ratio; it should be noted that, a technician may set the values of the preset temperature and the preset pressure ratio according to actual use requirements, as long as the temperature of the compressor 1 is higher than the preset temperature, it indicates that the compressor 1 has an overheating phenomenon, and when the pressure ratio of the compressor 1 is lower than the preset pressure ratio, it indicates that the pressure difference between the condenser 2 and the liquid injection pipeline 5 is insufficient; preferably, the preset temperature is 50 ℃ and the preset pressure ratio is 1.5. Further, it can be understood by those skilled in the art that, although the cooling requirement and the cooling condition of the compressor 1 are judged by judging whether the temperature of the compressor 1 is greater than the preset temperature and whether the pressure ratio of the compressor 1 is less than the preset pressure ratio in the preferred embodiment, this judgment is not restrictive, and the technicians may set the specific judgment manner by themselves according to the actual use condition, for example, by judging whether the time that the temperature of the compressor 1 is continuously greater than the preset temperature reaches a first preset time and whether the condition that the pressure ratio of the compressor 1 is less than the preset pressure ratio occurs in the first preset time, or by judging whether the time that the temperature of the compressor 1 is continuously greater than the preset temperature reaches a second preset time and the pressure ratio of the compressor 1 is continuously less than the preset pressure ratio in the second preset time, such variations are not to be regarded as a departure from the basic principles of the invention and are intended to be included within the scope of the invention.
Further, based on the determination result of step S102, if the controller determines that the temperature of the compressor 1 is greater than the preset temperature and the pressure ratio of the compressor 1 is less than the preset pressure ratio, it indicates that the compressor 1 has an overheating phenomenon and the pressure difference between the condenser 2 and the liquid injection pipeline 5 is insufficient; in this case, step S103 is performed, i.e., the controller can control the opening degree of the electronic expansion valve 3 to be decreased by a preset opening degree, so as to rapidly increase the pressure in the condenser 2. It should be noted that, a technician may set the preset opening degree according to actual use requirements, where the preset opening degree may be a constant value or a variable value; preferably, the controller is capable of determining the magnitude of the preset opening degree according to a difference between the temperature of the compressor 1 and the preset temperature and a difference between the pressure ratio of the compressor 1 and the preset pressure ratio, although the setting manner is not limited. Meanwhile, if the controller judges that the temperature of the compressor 1 is not greater than the preset temperature, the compressor 1 is not overheated, and if the pressure ratio of the compressor 1 is not less than the preset pressure ratio, the pressure difference between the condenser 2 and the liquid injection pipeline 5 is enough; in this case, step S101 may be executed again.
Further, after the opening degree of the electronic expansion valve 3 is decreased by the preset opening degree, step S104 is executed, that is, the controller can acquire the temperature of the compressor 1 again so as to judge the cooling condition of the compressor 1. Next, in step S105, the controller can determine whether the temperature of the compressor 1 is less than or equal to the preset temperature, so as to determine whether the compressor 1 has been sufficiently cooled. Based on the judgment result of step S105, if the controller judges that the temperature of the compressor 1 is less than or equal to the preset temperature, it indicates that the temperature of the compressor 1 is sufficiently low, in this case, step S106 is executed, that is, the controller no longer controls the opening degree of the electronic expansion valve 3 according to the temperature and pressure ratio of the compressor 1, so as to effectively ensure the heat exchange effect of the air conditioning unit. Meanwhile, if the controller determines that the temperature of the compressor 1 is greater than the preset temperature, it indicates that the temperature of the compressor 1 is not low enough, in which case step S107 is performed for the next determination.
Further, in step S107, the controller obtains the pressure ratio of the compressor 1 again to indirectly determine the refrigerant flow rate in the liquid injection line 5. Next, in step S108, the controller can determine whether the pressure ratio of the compressor 1 is greater than or equal to the preset pressure ratio again, so as to determine whether the refrigerant supply amount of the liquid injection pipeline 5 reaches the standard. Based on the judgment result of step S108, if the controller judges that the pressure ratio of the compressor 1 is greater than or equal to the preset pressure ratio, it indicates that the pressure difference between the condenser 2 and the liquid injection pipeline 5 is sufficiently large, in this case, step S106 is executed, that is, the controller no longer controls the opening degree of the electronic expansion valve 3 according to the temperature and the pressure ratio of the compressor 1, so as to effectively ensure the heat exchange effect of the air conditioning unit. If the controller determines that the pressure ratio of the compressor 1 is less than the preset pressure ratio, it indicates that the pressure difference between the condenser 2 and the liquid injection line 5 is not large enough, in which case step S109 is performed for the next determination.
Further, in step S109, the controller can acquire a high pressure of the compressor 1; it should be noted that the present invention does not limit the specific way in which the controller obtains the high pressure of the compressor 1, as long as the controller can finally obtain the high pressure of the compressor 1. Next, in step S110, the controller can determine whether the time that the high pressure of the compressor 1 is continuously greater than the preset high pressure reaches the fourth preset time, so as to determine whether a high pressure warning condition occurs in the compressor 1. Based on the judgment result of step S110, if the controller judges that the time that the high-pressure of the compressor 1 is continuously greater than the preset high-pressure reaches the fourth preset time, it indicates that the compressor 1 has a high-pressure early warning, in this case, step S106 is executed, that is, the controller no longer controls the opening degree of the electronic expansion valve 3 according to the temperature and the pressure ratio of the compressor 1, so as to effectively ensure the normal operation of the compressor 1. Meanwhile, if the controller determines that the time that the high pressure of the compressor 1 is continuously greater than the preset high pressure does not reach the fourth preset time, it indicates that the compressor 1 can still normally operate, and in this case, step S111 is executed to perform the next determination. The skilled person can understand that, the skilled person can set the magnitude of the preset high pressure and the length of the fourth preset time according to the actual use requirement, as long as when the time that the high pressure of the compressor 1 is continuously greater than the preset high pressure reaches the fourth preset time, it indicates that the compressor 1 has a high pressure early warning condition; preferably, the preset high pressure is 1000Kpa, and the fourth preset time is 5S.
Further, in step S111, the controller can acquire a low pressure of the compressor 1; it should be noted that the present invention does not limit the specific way in which the controller obtains the low-pressure of the compressor 1, as long as the controller can finally obtain the low-pressure of the compressor 1. Next, in step S112, the controller is capable of determining whether the time that the low pressure of the compressor 1 is continuously less than the preset low pressure reaches the fifth preset time, so as to determine whether a low pressure warning condition occurs in the compressor 1. Based on the judgment result of step S112, if the controller judges that the time that the low-pressure of the compressor 1 is continuously less than the preset low-pressure reaches the fifth preset time, it indicates that the compressor 1 has a low-pressure early warning, in this case, step S106 is executed, that is, the controller no longer controls the opening degree of the electronic expansion valve 3 according to the temperature and the pressure ratio of the compressor 1, so as to effectively ensure the normal operation of the compressor 1. Meanwhile, if the controller determines that the time that the low pressure of the compressor 1 is continuously less than the preset low pressure does not reach the fifth preset time, it indicates that the compressor 1 can still normally operate, and in this case, step S113 is performed to perform the next determination. The skilled person can understand that, the skilled person can set the magnitude of the preset low pressure and the length of the fifth preset time according to the actual use requirement, as long as when the time that the low pressure of the compressor 1 is continuously less than the preset low pressure reaches the fifth preset time, it is sufficient that the low pressure early warning condition of the compressor 1 occurs; preferably, the preset low pressure is 300Kpa, and the fifth preset time is 5S.
It should be noted that the execution sequence of the determination steps S105, S108, S110 and S112 can be exchanged at will, and such exchange between the execution sequences of the specific steps does not depart from the basic principle of the present invention, and falls into the protection scope of the present invention.
Further, in step S113, the controller may determine whether the opening degree of the electronic expansion valve 3 is greater than the preset minimum opening degree, so as to determine whether the heat exchange function of the air conditioning unit can be normally performed. It should be noted that, a technician can set the preset minimum opening according to actual use requirements; preferably, the preset minimum opening degree is thirty percent of the maximum opening degree of the electronic expansion valve 3. Based on the judgment result of step S113, if the opening degree of the electronic expansion valve 3 is greater than the preset minimum opening degree, it indicates that the heat exchange function of the air conditioning unit can be normally performed, and since the temperature of the compressor 1 is not reduced to the preset temperature at this time, step S103 is continuously performed, so as to further increase the pressure difference between the condenser 2 and the liquid injection pipeline 5; preferably, the time interval between two times of decreasing the opening degree of the electronic expansion valve 3 is a third preset time, and the third preset time is 10S. Of course, this is not restrictive, and the technician may set the length of the third preset time according to the actual use requirement. Meanwhile, if the opening degree of the electronic expansion valve 3 is less than or equal to the preset minimum opening degree, step S114 is executed, that is, the opening degree of the electronic expansion valve 3 is not continuously decreased, so as to effectively ensure the heat exchange capability of the air conditioning unit. In this case, the compressor 1 can only be cooled by the cooling capacity at that time, and although the cooling time required in this case is long, the temperature of the compressor 1 can be eventually reduced to the preset temperature.
In addition, it should be noted that during the execution of steps S103 to S114, the controller can always maintain the real-time operation load of the compressor 1 above the preset load, so as to effectively ensure that the compressor 1 does not heat up too fast. Specifically, when the controller adjusts the operation load of the compressor 1 according to other control logics, if the controller determines that the target load of the compressor 1 is smaller than the preset load, the controller controls the compressor 1 to operate at the preset load, so as to effectively ensure that the real-time operation load of the compressor 1 is not lower than the preset load; meanwhile, if the controller determines that the target load of the compressor 1 is greater than or equal to the preset load, the controller may directly control the compressor 1 to operate at the target load. As can be understood by those skilled in the art, the skilled person can set the magnitude of the preset load according to the actual situation; preferably, the preset load is thirty percent of the maximum load of the compressor 1.
Finally, it should be noted that the above examples are all preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. When the present invention is actually used, a part of the steps may be added or deleted as needed or the order between the different steps may be changed by those skilled in the art. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
So far, the preferred embodiments of the present invention have been described in conjunction with the accompanying drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A cooling control method for a compressor of an air conditioning unit is characterized in that the air conditioning unit comprises a liquid spraying pipeline, a main circulation loop, and the compressor, a condenser, an electronic expansion valve and an evaporator which are arranged on the main circulation loop, wherein the liquid spraying pipeline can spray and cool the compressor, the electronic expansion valve is arranged between the condenser and the evaporator,
the compressor cooling control method includes:
acquiring the temperature of the compressor;
acquiring a pressure ratio of the compressor;
and if the temperature of the compressor is higher than the preset temperature and the pressure ratio of the compressor is lower than the preset pressure ratio, controlling the opening degree of the electronic expansion valve according to the temperature and the pressure ratio of the compressor.
2. The compressor cooling control method according to claim 1, wherein the step of controlling the opening degree of the electronic expansion valve according to the temperature and the pressure ratio of the compressor if the temperature of the compressor is greater than a preset temperature and the pressure ratio of the compressor is less than a preset pressure ratio specifically comprises:
and if the time that the temperature of the compressor is continuously greater than the preset temperature reaches a first preset time and the condition that the pressure ratio of the compressor is smaller than the preset pressure ratio occurs in the first preset time, controlling the opening degree of the electronic expansion valve according to the temperature and the pressure ratio of the compressor.
3. The compressor cooling control method according to claim 1, wherein the step of controlling the opening degree of the electronic expansion valve according to the temperature and the pressure ratio of the compressor if the temperature of the compressor is greater than a preset temperature and the pressure ratio of the compressor is less than a preset pressure ratio specifically comprises:
and if the time that the temperature of the compressor is continuously greater than the preset temperature reaches a second preset time and the pressure ratio of the compressor is continuously less than the preset pressure ratio within the second preset time, controlling the opening degree of the electronic expansion valve according to the temperature and the pressure ratio of the compressor.
4. The compressor cooling control method according to any one of claims 1 to 3, wherein the step of "controlling the opening degree of the electronic expansion valve according to the temperature and pressure ratio of the compressor" specifically includes:
and reducing the opening degree of the electronic expansion valve by a preset opening degree, wherein the preset opening degree is determined according to the difference value between the temperature of the compressor and the preset temperature and/or the difference value between the pressure ratio of the compressor and the preset pressure ratio.
5. The compressor cooling control method according to claim 4, wherein the step of reducing the opening degree of the electronic expansion valve by a preset opening degree further comprises:
and reducing the opening degree of the electronic expansion valve by a preset opening degree every third preset time.
6. The compressor cooling control method according to any one of claims 1 to 3, wherein after the step of "controlling the opening degree of the electronic expansion valve according to the temperature and pressure ratio of the compressor" is performed, the compressor cooling control method further comprises:
obtaining the temperature of the compressor again;
and if the temperature of the compressor is less than or equal to the preset temperature, the opening degree of the electronic expansion valve is not controlled according to the temperature and the pressure ratio of the compressor.
7. The compressor cooling control method according to any one of claims 1 to 3, wherein after the step of "controlling the opening degree of the electronic expansion valve according to the temperature and pressure ratio of the compressor" is performed, the compressor cooling control method further comprises:
obtaining the pressure ratio of the compressor again;
and if the pressure ratio of the compressor is greater than or equal to the preset pressure ratio, the opening degree of the electronic expansion valve is not controlled according to the temperature and the pressure ratio of the compressor any more.
8. The compressor cooling control method according to any one of claims 1 to 3, wherein after the step of "controlling the opening degree of the electronic expansion valve according to the temperature and pressure ratio of the compressor" is performed, the compressor cooling control method further comprises:
acquiring the high-pressure of the compressor;
and if the time that the high-pressure of the compressor is continuously greater than the preset high-pressure reaches a fourth preset time, the opening degree of the electronic expansion valve is not controlled according to the temperature and the pressure ratio of the compressor.
9. The compressor cooling control method according to any one of claims 1 to 3, wherein after the step of "controlling the opening degree of the electronic expansion valve according to the temperature and pressure ratio of the compressor" is performed, the compressor cooling control method further comprises:
acquiring the low-pressure of the compressor;
and if the time that the low-pressure of the compressor is continuously less than the preset low-pressure reaches a fifth preset time, the opening degree of the electronic expansion valve is not controlled according to the temperature and the pressure ratio of the compressor.
10. The compressor cooling control method according to any one of claims 1 to 3, wherein after the step of "controlling the opening degree of the electronic expansion valve according to the temperature and pressure ratio of the compressor" is performed, the compressor cooling control method further comprises:
if the target load of the compressor is less than a preset load, operating the compressor at the preset load;
operating the compressor at the target load if the target load of the compressor is greater than or equal to the preset load.
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| CN201910726936.5A CN112344510A (en) | 2019-08-07 | 2019-08-07 | Compressor cooling control method for air conditioning unit |
| PCT/CN2019/127938 WO2021022766A1 (en) | 2019-08-07 | 2019-12-24 | Compressor cooling control method for air conditioning unit |
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| CN201910726936.5A CN112344510A (en) | 2019-08-07 | 2019-08-07 | Compressor cooling control method for air conditioning unit |
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| CN114216201A (en) * | 2021-12-02 | 2022-03-22 | 珠海格力电器股份有限公司 | Control method of fixed-frequency air conditioner and fixed-frequency air conditioner |
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| CN113639485B (en) * | 2021-07-23 | 2023-03-28 | 青岛海尔空调电子有限公司 | Method and device for adjusting exhaust superheat degree of heat pump equipment and heat pump equipment |
| CN114593472B (en) * | 2022-03-11 | 2023-12-19 | 广东美的暖通设备有限公司 | Control method and device of spraying system and electronic equipment |
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